An auxiliary installation fixture for valve stem seals

Abstract

This utility model relates to the field of medical device technology. An auxiliary installation fixture for a valve stem sealing ring includes a conical sleeve for fitting over a valve stem. The valve stem includes a connecting end and a sealing end connected sequentially along the axial direction. The outer diameter of the connecting end is smaller than the outer diameter of the sealing end, and a groove for embedding the sealing ring is formed on the outer wall of the sealing end. The conical sleeve includes a conical expanding guide portion and a cylindrical pushing portion connected sequentially along the axial direction. The inner wall of the connection between the conical expanding guide portion and the cylindrical pushing portion abuts against the connection between the connecting end and the sealing end. The axial length of the cylindrical pushing portion matches the distance from the connection between the connecting end and the sealing end to the groove. It also includes a cylindrical sleeve, the inner wall of which matches the outer wall of the sealing end. This utility model assists in the installation of the sealing ring, effectively reducing installation difficulty and improving efficiency.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a tooling for installing sealing rings. Background Technology

[0002] A gastric lavage machine is a medical device suitable for use in medical units and emergency centers to rescue patients suffering from food poisoning or ingestion of poison, as well as for preoperative gastric lavage. The fluid switching device is a key component, with the valve stem and sealing ring playing crucial roles. To ensure a tight seal, the sealing ring is typically fitted into a groove in the valve stem, with its inner diameter smaller than the outer diameter of the valve stem, making installation somewhat inconvenient. After being fitted onto the valve stem, the sealing ring requires repeated running-in to achieve optimal performance.

[0003] Currently, there is a lack of auxiliary installation tools that simplify the installation of sealing rings. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides an auxiliary installation fixture for valve stem sealing rings, thereby solving at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, this utility model provides an auxiliary installation fixture for a valve stem sealing ring, characterized in that it includes a tapered sleeve for fitting around the valve stem, wherein the valve stem includes a connecting end and a sealing end connected sequentially along the axial direction, the outer diameter of the connecting end is smaller than the outer diameter of the sealing end, and a groove for embedding the sealing ring is provided on the outer wall of the sealing end.

[0006] The conical sleeve includes a conical expanding guide and a cylindrical flat pushing part connected sequentially in the axial direction. The inner wall of the connection between the conical expanding guide and the cylindrical flat pushing part abuts against the connection between the connecting end and the sealing end.

[0007] The axial length of the cylindrical push section is matched with the distance between the connection point of the connecting end and the sealing end and the groove.

[0008] It also includes a cylindrical sleeve, the inner wall of which matches the outer wall of the sealing end.

[0009] This utility model assists in the installation of the sealing ring, effectively reducing installation difficulty and improving efficiency. The sealing ring is enlarged through a tapered expanding guide, and then pushed into a suitable groove via a cylindrical pushing part. A cylindrical sleeve further shapes and runs the sealing ring after it is fitted onto the valve stem, ensuring a rounded effect in the circumferential direction.

[0010] More preferably, the outer wall of the cylindrical flat pushing part is provided with scale lines.

[0011] It facilitates quick matching of grooves in different positions.

[0012] More preferably, the outer contour of the sealing ring includes an inner cylindrical surface and an outer cylindrical surface disposed inside and outside the ring. Both sides of the outer cylindrical surface are connected to both sides of the inner cylindrical surface through a first rounded transition surface, a radial extension surface and a second rounded transition surface connected in sequence.

[0013] To facilitate the axial reciprocating motion of the cylindrical sleeve, two rounded transition surfaces act on the inner wall of the cylindrical sleeve, thereby shaping it.

[0014] More preferably, the axial length of the cylindrical sleeve is greater than the axial length of the sealing end and less than the axial length of the valve stem.

[0015] More preferably, the inner hole of the tapered expanding guide is a circular hole, and the inner diameter of the circular hole is larger than the outer diameter of the connecting end. The inner diameter of the circular hole is smaller than the outer diameter of the sealing end.

[0016] More preferably, the inner wall of the cylindrical push portion is slidably connected to the outer wall of the sealing end.

[0017] More preferably, the inner diameter of the cylindrical sleeve matches the inner diameter of the valve body where the valve stem mates.

[0018] This facilitates the simulation of the break-in process between the valve stem and the valve body during reciprocating motion.

[0019] More preferably, the groove is fitted with an inner and outer O-ring and a sealing ring.

[0020] This device is suitable for installing sealing rings located outside of O-rings. O-rings have high elasticity and do not require this device for assembly.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention is inexpensive, simple in structure, clean and pollution-free, and will not damage the workpiece.

[0023] While sealing rings are designed to ensure sealing and strength, their limited elasticity due to material properties makes them difficult to fit into the valve stem groove during installation. Furthermore, after installation, they require repeated friction to achieve optimal fit. This device effectively reduces installation difficulty and improves efficiency. Attached Figure Description

[0024] Figure 1 This is an exploded view of a specific embodiment 1 of the present utility model;

[0025] Figure 2 This is a cross-sectional view of the valve stem and the tapered sleeve in specific embodiment 1 of this utility model.

[0026] Figure 3 This is a cross-sectional view of the valve stem and cylindrical sleeve in a specific embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional view of the sealing ring in specific embodiment 1 of this utility model.

[0028] In the diagram: 1 is a conical sleeve, 2 is a valve stem, 3 is a cylindrical sleeve, and 4 is a sealing ring;

[0029] 11 is a tapered expanding guide section, and 12 is a cylindrical flat pushing section;

[0030] 21 is the connecting end, and 22 is the sealing end. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] See Figures 1 to 4 Specific Embodiment 1: An auxiliary installation fixture for a valve stem sealing ring includes a conical sleeve 1 for fitting around a valve stem 2. The valve stem 2 includes a connecting end 21 and a sealing end 22 connected sequentially along the axial direction. The outer diameter of the connecting end 21 is smaller than the outer diameter of the sealing end 22. A groove for embedding the sealing ring 4 is formed on the outer wall of the sealing end 22. The conical sleeve 1 includes a conical expanding guide portion 11 and a cylindrical pushing portion 12 connected sequentially along the axial direction. The inner wall of the connection between the conical expanding guide portion 11 and the cylindrical pushing portion 12 abuts against the connection between the connecting end 21 and the sealing end 22. The axial length of the cylindrical pushing portion matches the distance between the connection between the connecting end 21 and the sealing ring 4 and the groove. It also includes a cylindrical sleeve 3, the inner wall of which matches the outer wall of the sealing end 22. This utility model assists in the installation of the sealing ring 4, effectively reducing installation difficulty and improving efficiency. This invention achieves the enlargement of the sealing ring 4 through a tapered enlargement guide, and then pushes the sealing ring 4 into a suitable groove through a cylindrical pusher. The cylindrical sleeve 3 further shapes and runs the sealing ring 4 after it is fitted onto the valve stem 2, ensuring a rounded effect around the circumference of the sealing ring 4. The outer diameter of the tapered enlargement guide increases from the distance away from the cylindrical pusher to the distance adjacent to it.

[0033] The outer wall of the cylindrical pusher 12 may be provided with scale lines. This facilitates quick matching of grooves at different positions. The length direction of the scale lines is the axial direction of the cylindrical pusher 12. The scale lines are used to indicate the axial length of the cylindrical pusher.

[0034] The outer contour of the sealing ring 4 includes an inner cylindrical surface and an outer cylindrical surface. Both sides of the outer cylindrical surface are connected to the two sides of the inner cylindrical surface via a first rounded transition surface, a radially extending surface, and a second rounded transition surface connected in sequence. This allows the two rounded transition surfaces to act on the inner wall of the cylindrical sleeve 3 during its axial reciprocating motion, thereby shaping it. The radius of the first rounded transition surface is larger than the radius of the second rounded transition surface.

[0035] The axial length of the cylindrical sleeve 3 is greater than the axial length of the sealing end 22, but less than the axial length of the valve stem 2.

[0036] The inner hole of the tapered expanding guide part 11 is a round hole, and the inner diameter of the round hole is larger than the outer diameter of the connecting end 21.

[0037] The inner wall of the cylindrical push part 12 is slidably connected to the outer wall of the sealing end 22. The inner wall of the cylindrical push part 12 matches the outer wall of the sealing end 22.

[0038] The inner diameter of the cylindrical sleeve 3 matches the inner diameter of the valve body where the valve stem 2 mates. This facilitates the simulation of the running-in process between the valve stem 2 and the valve body during reciprocating motion.

[0039] The groove is fitted with an inner and outer O-ring and a sealing ring 4. This device is suitable for installing the sealing ring 4 located outside the O-ring. The O-ring has high elasticity and does not require assembly by this device.

[0040] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. An auxiliary installation fixture for a valve stem sealing ring, characterized in that, It includes a tapered sleeve for fitting over a valve stem, the valve stem including a connecting end and a sealing end connected sequentially along the axial direction, the outer diameter of the connecting end being smaller than the outer diameter of the sealing end, and a groove for embedding a sealing ring being formed on the outer wall of the sealing end; The conical sleeve includes a conical expanding guide and a cylindrical flat pushing part connected sequentially in the axial direction. The inner wall of the connection between the conical expanding guide and the cylindrical flat pushing part abuts against the connection between the connecting end and the sealing end. The axial length of the cylindrical push section is matched with the distance between the connection point of the connecting end and the sealing end and the groove. It also includes a cylindrical sleeve, the inner wall of which matches the outer wall of the sealing end.

2. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The outer wall of the cylindrical flat pusher is provided with scale lines.

3. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The outer contour of the sealing ring includes an inner cylindrical surface and an outer cylindrical surface. Both sides of the outer cylindrical surface are connected to both sides of the inner cylindrical surface through a first rounded transition surface, a radial extension surface, and a second rounded transition surface connected in sequence.

4. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The axial length of the cylindrical sleeve is greater than the axial length of the sealing end, but less than the axial length of the valve stem.

5. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The inner hole of the tapered expansion guide is a circular hole, and the inner diameter of the circular hole is larger than the outer diameter of the connecting end.

6. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The inner wall of the cylindrical pusher is slidably connected to the outer wall of the sealing end.

7. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The inner diameter of the cylindrical sleeve matches the inner diameter of the valve body where the valve stem mates.

8. The auxiliary installation fixture for a valve stem sealing ring according to claim 1, characterized in that: The groove is fitted with an inner and outer O-ring and a sealing ring.

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